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https://www.readbyqxmd.com/read/28898787/theoretical-investigation-of-the-%C3%AF-%C3%AF-stacking-interactions-in-substituted-pyridinium-ion
#1
Abolfazl Azizi, Ali Ebrahimi
The interaction between positively charged aromatic groups (π(+)-π(+)) is characterized by stacked pyridinium ion derivatives X-PyH(+)||X-PyH(+) (XH, NH2, OH, CN, F, Br and Cl) at the M06-2X/6-311++G(d,p) level of theory in the presence of three solvents. The results indicate the formation of π(+)-π(+) stacking in a dielectric solvent can be due to the significant stability of the charge-charge repulsion forces. The trend in the absolute value of stacking interaction energy |ΔEπ(+)⋯π(+)| with respect to the solvent is formamide>water>acetone...
September 4, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28836788/emulsion-solvent-evaporation-induced-self-assembly-of-block-copolymers-containing-ph-sensitive-block
#2
Yuqing Wu, Ke Wang, Haiying Tan, Jiangping Xu, Jintao Zhu
A simple yet efficient method is developed to manipulate the self-assembly of pH-sensitive block copolymers (BCPs) confined in emulsion droplets. Addition of acid induces significant variation in morphological transition (e.g., structure and surface composition changes) of the polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) assemblies, due to the hydrophobic-hydrophilic transition of the pH-sensitive P4VP block via protonation. In the case of pH > pKa(P4VP) (pKa (P4VP) = 4.8), the BCPs can self-assemble into pupa-like particles because of the nearly neutral wetting of PS and P4VP blocks at the oil/water interface...
August 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28829954/microparticle-templating-as-a-route-to-nanoscale-polymer-vesicles-with-controlled-size-distribution-for-anticancer-drug-delivery
#3
Weichang Li, Siqi Liu, Hang Yao, Guoxing Liao, Ziwei Si, Xiangjun Gong, Li Ren, Linge Wang
Polymer vesicles are self-assembled shells of amphiphilic block copolymers (BCPs) that have attracted tremendous interest due to their encapsulation ability and intracellular delivery of therapeutic agents. However, typical processes for the formation of polymer vesicles lead to ensembles of structures with a broad size distribution (from nanometer to micrometer scale) which result in a limitation for efficient cellular uptake. In this study, we present a simple and efficient approach for the fabrication of polymer vesicles with uniform nanoscale dimensions from template formation of electrosprayed particles in a high throughput manner...
August 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28809474/nano-in-nano-approach-for-enzyme-immobilization-based-on-block-copolymers
#4
Finizia Auriemma, Claudio De Rosa, Anna Malafronte, Rocco Di Girolamo, Chiara Santillo, Yuri Gerelli, Giovanna Fragneto, Robert Barker, Vincenzo Pavone, Ornella Maglio, Angela Lombardi
We set up a facile approach for fabrication of supports with tailored nanoporosity for immobilization of enzymes. To this aim block copolymers (BCPs) self-assembly has been used to prepare nanostructured thin films with well-defined architecture containing pores of tailorable size delimited by walls with tailorable degree of hydrophilicity. In particular, we employed a mixture of polystyrene-block-poly(l-lactide) (PS-PLLA) and polystyrene-block-poly(ethylene oxide) (PS-PEO) diblock copolymers to generate thin films with a lamellar morphology consisting of PS lamellar domains alternating with mixed PEO/PLLA blocks lamellar domains...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28807222/polymyxin-b-as-an-inhibitor-of-lipopolysaccharides-contamination-of-herb-crude-polysaccharides-in-mononuclear-cells
#5
Xiao-Xiao Lu, Yi-Fan Jiang, Hong Li, Ying-Ye Ou, Zhi-De Zhang, Hong-Ye DI, Dao-Feng Chen, Yun-Yi Zhang
Lipopolysaccharides (LPS) contamination in herbal crude polysaccharides is inevitable. The present study was performed to explore the effect of polymyxin B on abolishing the influence of LPS contamination in mononuclear cells. LPS was pretreated with polymyxin B sulfate (PB) at different concentrations for 1, 5 or 24 h, and then used to stimulate RAW264.7 and mouse peritoneal macrophages (MPMs). The nitric oxide (NO) and tumor necrosis factor-α (TNF-α) in cell culture supernatant, as the indications of cell response, were assayed...
July 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28800236/inorganic-nanoparticle-induced-morphological-transition-for-confined-self-assembly-of-block-copolymers-within-emulsion-droplets
#6
Yan Zhang, Yun He, Nan Yan, Yutian Zhu, Yuexin Hu
Recently, it has been reported that the incorporation of functional inorganic nanoparticles (NPs) into the three-dimensional (3D) confined self-assembly of block copolymers (BCPs) creates the unique nanostructured hybrid composites, which can not only introduce new functions to BCPs but also induce some interesting morphological transitions of BCPs. In the current study, we systematically investigate the cooperative self-assembly of a series of size-controlled and surface chemistry-tunable gold nanoparticles (AuNPs) and polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) diblock copolymer within the emulsion droplets...
August 28, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28780460/nanoscale-trifunctional-bovine-hemoglobin-for-fabricating-molecularly-imprinted-polydopamine-via-pickering-emulsions-hydrogels-polymerization
#7
Yanhua Sun, Shian Zhong
In this work, a novel strategy was developed for the selective recognition of protein based on oil-in-water Pickering emulsions-hydrogels polymerization and interfacial imprinting method. For the first time, nanoscale trifunctional bovine hemoglobin (BHb) played three roles simultaneously during the process, including emulsifier, template protein and sacrificial material for further exposing recognition sites. Prior to acting as stabilizers, bovine hemoglobin colloidal particles (BCPs) were firstly prepared by acidification and heat denaturation...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28745381/toward-a-reverse-hierarchy-of-halogen-bonding-between-bromine-and-iodine
#8
Emmanuel Aubert, Enrique Espinosa, Irène Nicolas, Olivier Jeannin, Marc Fourmigué
We compare here the halogen bond characteristics of bimolecular adducts involving either N-bromo- or N-iodosaccharin as strong halogen bond donors, with 4-picoline as a common XB acceptor. In the NBSac·Pic system, the bromine atom of NBSac is displaced toward the picoline, almost at a median position between the two nitrogen atoms, NSac and N'Pic, with NSacBr and BrN'Pic distances at 2.073(6) and 2.098(6) Å respectively. This extreme situation contrasts with the analogous iodine derivative, NISac·Pic, where the NSac-I and IN'Pic distances amount to 2...
July 26, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28745060/tunable-fluorescence-of-a-semiconducting-polythiophene-positioned-on-dna-origami
#9
Johanna Zessin, Franziska Fischer, Andreas Heerwig, Alfred Kick, Susanne Boye, Manfred Stamm, Anton Kiriy, Michael Mertig
A novel approach for the integration of π-conjugated polymers (CPs) into DNA-based nanostructures is presented. Using the controlled Kumada catalyst-transfer polycondensation, well-defined thiophene-based polymers with controllable molecular weight, specific end groups, and water-soluble oligoethylene glycol-based side chains were synthesized. The end groups were used for the easy but highly efficient click chemistry-based attachment of end-functionalized oligodeoxynucleotides (ODNs) with predesigned sequences...
July 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28710147/dietary-guidelines-for-breast-cancer-patients-a-critical-review
#10
REVIEW
Ana Teresa Limon-Miro, Veronica Lopez-Teros, Humberto Astiazaran-Garcia
Current dietary guidelines for breast cancer patients (BCPs) fail to address adequate dietary intakes of macro- and micronutrients that may improve patients' nutritional status. This review includes information from the PubMed and Biomed Central databases over the last 15 y concerning dietary guidelines for BCPs and the potential impact of a personalized, nutrient-specific diet on patients' nutritional status during and after antineoplastic treatment. Results indicated that BCPs should receive a nutritional assessment immediately after diagnosis...
July 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28701696/numerical-simulations-of-directed-self-assembly-in-diblock-copolymer-films-using-zone-annealing-and-pattern-templating
#11
Joseph D Hill, Paul C Millett
Bulk fabrication of surface patterns with sub-20 nm feature sizes is immensely desirable for many existing and emerging technologies. Directed self-assembly (DSA) of block copolymers (BCPs) has been a recently demonstrated approach to achieve such feature resolution over large-scale areas with minimal defect populations. However, much work remains to understand and optimize DSA methods in order to move this field forward. This paper presents large-scale numerical simulations of zone annealing and chemo-epitaxy processing of BCP films to achieve long-range orientational order...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687553/development-of-a-pharmacy-resident-rotation-to-expand-decentralized-clinical-pharmacy-services
#12
John D Hill, Jonathan P Williams, Julie F Barnes, Katie M Greenlee, Bcps-Aq Cardiology, Mandy C Leonard
PURPOSE: The development of a pharmacy resident rotation to expand decentralized clinical pharmacy services is described. SUMMARY: In an effort to align with the initiatives proposed within the ASHP Practice Advancement Initiative, the department of pharmacy at Cleveland Clinic, a 1,400-bed academic, tertiary acute care medical center in Cleveland, Ohio, established a goal to provide decentralized clinical pharmacy services for 100% of patient care units within the hospital...
July 15, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28681944/carbohydrate-based-block-copolymer-thin-films-ultrafast-nano-organization-with-7-nm-resolution-using-microwave-energy
#13
Yingjie Liao, Wen-Chang Chen, Redouane Borsali
Block copolymers (BCP) can self-assemble into nanoscale patterns with a wide variety of applications in the semiconductor industry. The self-assembly of BCPs is commonly accomplished by solvent vapor or thermal annealing, but generally these methods require long time (few hours) to obtain nanostructured thin films. In this contribution, a new and ultrafast method (using microwaves) is proposed-high temperature solvent vapor annealing (HTSVA), combining solvent vapor annealing with thermal annealing, to achieve fast and controllable self-assembly of amphiphilic BCP thin films...
July 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28676320/body-contouring-procedures-in-three-or-more-anatomical-areas-are-associated-with-long-term-body-mass-index-decrease-in-massive-weight-loss-patients-a-retrospective-cohort-study
#14
Itay Wiser, Lior Heller, Coral Spector, Ehud Fliss, Tali Friedman
BACKGROUND: Massive weight loss (MWL) patients who undergo body contouring plastic surgery (BCPS) display superior long-term weight maintenance. The effect of the number of anatomical areas contoured on weight dynamics is undetermined. OBJECTIVES: To determine whether body mass index (BMI) dynamics following BCPS are associated with the number of anatomical areas operated. METHODS: A retrospective cohort study was conducted. Study groups were defined by the number of anatomical areas operated (1, 2, and 3+)...
September 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28582603/stimuli-responsive-shape-transforming-nanostructured-particles
#15
Junhyuk Lee, Kang Hee Ku, Mingoo Kim, Jae Man Shin, Junghun Han, Chan Ho Park, Gi-Ra Yi, Se Gyu Jang, Bumjoon J Kim
Development of particles that change shape in response to external stimuli has been a long-thought goal for producing bioinspired, smart materials. Herein, the temperature-driven transformation of the shape and morphology of polymer particles composed of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) block copolymers (BCPs) and temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) surfactants is reported. PNIPAM acts as a temperature-responsive surfactant with two important roles. First, PNIPAM stabilizes oil-in-water droplets as a P4VP-selective surfactant, creating a nearly neutral interface between the PS and P4VP domains together with cetyltrimethylammonium bromide, a PS-selective surfactant, to form anisotropic PS-b-P4VP particles (i...
June 5, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28557444/complex-and-hierarchical-2d-assemblies-via-crystallization-driven-self-assembly-of-poly-l-lactide-homopolymers-with-charged-termini
#16
Xiaoming He, Yunxiang He, Ming-Siao Hsiao, Robert L Harniman, Sam Pearce, Mitchell A Winnik, Ian Manners
Poly(l-lactide) (PLLA)-based nanoparticles have attracted much attention with respect to applications in drug delivery and nanomedicine as a result of their biocompatibility and biodegradability. Nevertheless, the ability to prepare PLLA assemblies with well-defined shape and dimensions is limited and represents a key challenge. Herein we report access to a series of monodisperse complex and hierarchical colloidally stable 2D structures based on PLLA cores using the seeded growth, "living-crystallization-driven self-assembly" method...
June 30, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541658/characterizing-patterned-block-copolymer-thin-films-with-soft-x-rays
#17
Daniel F Sunday, Jiaxing Ren, Christopher D Liman, Lance D Williamson, Roel Gronheid, Paul F Nealey, R Joseph Kline
The directed self-assembly (DSA) of block copolymers (BCPs) is a potential solution for patterning critical features for integrated circuits at future technology nodes. For this process to be implemented, there needs to be a better understanding of how the template guides the assembly and induces subsurface changes in the lamellar structure. Using a rotational transmission X-ray scattering measurement coupled with soft X-rays to improve contrast between polymer components, the impact of the ratio of the guiding stripe width (W) to the BCP pitch (L0) was investigated...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28538206/spectroscopic-far-or-terahertz-mid-infrared-and-raman-investigation-thermal-analysis-and-biological-activity-of-piplartine
#18
Anubha Srivastava, T Karthick, B D Joshi, Rashmi Mishra, Poonam Tandon, A P Ayala, Javier Ellena
Research in the field of medicinal plants including Piper species like long pepper (Piper longum L.- Piperaceae) is increasing all over the world due to its use in traditional and Ayurvedic medicine. Piplartine (piperlongumine, 5,6-dihydro-1-[(2E)-1-oxo-3-(3,4,5-trimethoxyphenyl)-2-propenyl]-2(1H)-pyridinone), a biologically active alkaloid/amide was isolated from the phytochemical investigations of Piper species, as long pepper. This alkaloid has cytotoxic, anti-fungal, anti-diabetic, anti-platelet aggregation, anti-tumoral, anxiolytic, anti-depressant, anti-leishmanial, and genotoxic activities, but, its anticancer property is the most promising and has been widely explored...
May 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28525260/three-dimensional-visualization-and-characterization-of-polymeric-self-assemblies-by-transmission-electron-microtomography
#19
Hiroshi Jinnai, Takeshi Higuchi, Xiaodong Zhuge, Akihito Kumamoto, Kees Joost Batenburg, Yuichi Ikuhara
Self-assembling structures and their dynamical processes in polymeric systems have been investigated using three-dimensional transmission electron microscopy (3D-TEM). Block copolymers (BCPs) self-assemble into nanoscale periodic structures called microphase-separated structures, a deep understanding of which is important for creating nanomaterials with superior physical properties, such as high-performance membranes with well-defined pore size and high-density data storage media. Because microphase-separated structures have become increasingly complicated with advances in precision polymerization, characterizing these complex morphologies is becoming increasingly difficult...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28521981/self-assembly-of-maltoheptaose-b-pmma-block-copolymer-systems-10nm-resolution-in-thin-film-and-bulk-states
#20
C M Noronha, I Otsuka, C Bouilhac, C Rochas, P L M Barreto, R Borsali
This paper describes the self-assembly of oligosaccharide-based hybrid block copolymers (BCPs) consisting of maltoheptaose (MH) and poly(methyl methacrylate) (PMMA) into 10nm scale lamellar and cylindrical phases depending on the volume fractions of MH (ϕMH) and the annealing process. Time resolved SAXS study of the BCP bulk samples during thermal annealing indicated that the BCPs phase separate into 10nm scale periodical structures. The solvent vapor annealing induced self-organizations of the BCP into different phases depending on ϕMH and the weight fraction of THF/H2O...
August 15, 2017: Carbohydrate Polymers
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